Zipping sound when booting/starting/waking up on rMBP 13"

Hi,
Whenever I boot my retina macbook 13 inch up from sleep mode, or from when its completely turned off, there is a zipping sound in the upper right corner of the body of the machine. The sound comes from right underneath the power button.
This is actually my third replacement macbook pro, and I've never heard this sound on either of the two from before.
The sound is quite similar to the optical disk drive revving up for operation on a non-retina macbook pro, but obviously there is no optical drive on the rMBP. It is very similar to the sound of zipping up a sweater very quickly, or the sound of zipping up the fly of a pair of pants (for us guys )
Could someone please tell me if this is normal? In all honesty, I don't want to go for a fourth macbook... I just want this to not affect how the machine will operate in the future.
Thank you

I figure it may be the fan revving up for use. But I don't know why it would make this kind of noise.
This is the sound that I'm hearing:
https://www.dropbox.com/s/mrsxs8n23whywlh/Voice00002.3gp
(It is the sound at 5~6 seconds)
Could I get some thoughts from everyone? Thanks!

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Zipping sound when booting/starting/waking up on rMBP 13"

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